- - Is this normal?
(http://www.diyaudio.com/forums/multi-way/97638-normal.html)

A_Reef_Scene

7th March 2007 07:23 PM

Is this normal?

I just a reading of 6.1 ohms on a dayton rs 150s-8. I thought that is was a 8 ohm speaker. I also took it out of the garage, could the cold have given me this off reading?

Jonathan Bright

7th March 2007 07:50 PM

I'd have thought that your reading was perfectly normal. The figures quoted for speaker impedance are usually specified as "nominal". The measurement is made of a coil inside a magnetic field and the impedance will vary with fequency. An "8ohm" speaker is usually only exactly 8ohms at a 3 or 5 points depending on the frequency and the type of box it is in etc. . What you probably measured was the DC component which you would expect to be about 6ohms. I think its perfect. You might find a text book or website that discusses speaker impedance. You will find that will address your concerns with a better technical explanation.

mashaffer

7th March 2007 07:51 PM

Thats about right for an 8 ohm speaker. AC impedence is higher than the DC resistance.